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SubjectRe: [PATCH v5 1/1] xen/time: do not decrease steal time after live migration on xen
Hi Dongli,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on v4.14-rc7 next-20171018]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Dongli-Zhang/xen-time-do-not-decrease-steal-time-after-live-migration-on-xen/20171102-011408
base: https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm64

All error/warnings (new ones prefixed by >>):

drivers//xen/time.c: In function 'xen_accumulate_runstate_time':
>> drivers//xen/time.c:92:20: error: implicit declaration of function 'kcalloc' [-Werror=implicit-function-declaration]
runstate_delta = kcalloc(num_possible_cpus(),
^~~~~~~
>> drivers//xen/time.c:92:18: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
runstate_delta = kcalloc(num_possible_cpus(),
^
>> drivers//xen/time.c:128:3: error: implicit declaration of function 'kfree' [-Werror=implicit-function-declaration]
kfree(runstate_delta);
^~~~~
cc1: some warnings being treated as errors

vim +/kcalloc +92 drivers//xen/time.c

82
83 void xen_accumulate_runstate_time(int action)
84 {
85 struct vcpu_runstate_info state;
86 int cpu, i;
87
88 switch (action) {
89 case -1: /* backup runstate time before suspend */
90 WARN_ON_ONCE(unlikely(runstate_delta));
91
> 92 runstate_delta = kcalloc(num_possible_cpus(),
93 sizeof(*runstate_delta),
94 GFP_KERNEL);
95 if (unlikely(!runstate_delta)) {
96 pr_alert("%s: failed to allocate runstate_delta\n",
97 __func__);
98 return;
99 }
100
101 for_each_possible_cpu(cpu) {
102 xen_get_runstate_snapshot_cpu_delta(&state, cpu);
103 memcpy(runstate_delta[cpu].time, state.time,
104 RUNSTATE_max * sizeof(*runstate_delta[cpu].time));
105 }
106
107 break;
108
109 case 0: /* backup runstate time after resume */
110 if (unlikely(!runstate_delta)) {
111 pr_alert("%s: cannot accumulate runstate time as runstate_delta is NULL\n",
112 __func__);
113 return;
114 }
115
116 for_each_possible_cpu(cpu) {
117 for (i = 0; i < RUNSTATE_max; i++)
118 per_cpu(old_runstate_time, cpu)[i] +=
119 runstate_delta[cpu].time[i];
120 }
121 break;
122
123 default: /* do not accumulate runstate time for checkpointing */
124 break;
125 }
126
127 if (action != -1 && runstate_delta) {
> 128 kfree(runstate_delta);
129 runstate_delta = NULL;
130 }
131 }
132

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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